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HK: Fachverband Physik der Hadronen und Kerne

HK 41: Structure and Dynamics of Nuclei VII

HK 41.3: Talk

Wednesday, March 30, 2022, 14:45–15:00, HK-H7

Precision mass measurements of actinides at SHIPTRAP — •Manuel J. Gutiérrez^1,2, Michael Block^1,2,3, Christoph E. Düllmann^1,2,3, Francesca Giacoppo^1,2, Oliver Kaleja^1,4, Kanika Kanika^1,5, Jacques J. W. van de Laar^2,3, Yury Nechiporenko^6,7, Yuri Novikov^6,7, Wolfgang Quint^1,5, and Dennis Renisch^2,3 — ¹GSI Darmstadt, Germany — ²HIM Mainz, Germany — ³JGU Mainz, Germany — ⁴University of Greifswald, Germany — ⁵University of Heidelberg, Germany — ⁶PNPI Gatchina, Russia — ⁷Saint Petersburg State University, Russia

The existence of superheavy nuclides is possible due to quantum-mechanical shell effects. A region of enhanced stability, dubbed island of stability, was long ago predicted at the next spherical shell closure above the doubly magic ²⁰⁸Pb. Although not yet experimentally found, its location has been pinned down to around Z=114–126 and N=184. More information can be retrieved from the study of the actinides, linked to heavier nuclides by decay chains.

Penning-trap mass spectrometry provides precise measurements of atomic masses, which directly translate into binding energies. Their high-resolution measurement provides a powerful indicator of nuclear structure effects. An offline campaign for direct mass measurements of selected U and Pu isotopes was recently carried out at the SHIPTRAP mass spectrometer at GSI, usually devoted to the investigation of superheavy elements. This campaign complements the more extensive program carried out at the TRIGA-TRAP setup in Mainz. This contribution presents the first results of the SHIPTRAP campaign.